Dynamo-electric machine



Aug. 2 ,1923. 1,466,304 P. A. KOCH DYNAMO ELECTRIC MACHINE Filed m 9, 1 922 i a 2' E i J E 3 E 3 E 1 I I I a z I l i Q l 1 I I L I 1 lhvehtor.

. His mummy Patented Aug. 28, 1923.

UNITED STATES PATENT "oFFic PAUL AUGUST K001i, nEoEAsEn, LATE or cnnnnorrnnnuns, GERMANY, BY 'AUGUSTE ELSBETH noon, ADMINISTRATE-IX, or cnAnLorrEnBURc, GERMANY, AssIGno TO GENERAL ELEcrEIccoMrenY, A conronarron or NEW YORK."

Dynamo-ELECTRIC MACHINE.

Application filed May 9,

To all whom it may concern: a p

'Be it known that PAUL AUGUST Kocn, deceased, lateof Charlottenburg, Germany, during his lifetime ,in'vented certain new and useful Improvements in Dynamo-Electric Machines, and that I, iAUcUs'r Ens- BETH KooI-I, widow of the said PAUL AU-f GUST Koon, do hereby declare, to the best of my knowledge and belief, that the follow ing specification, taken in connection with the drawings furnished and forming a part of the same, 1s a clear, true, and complete description of said improvements.

The invention relates to dynamo electric" machlnes, and has for its ob ect a novel arturns producing it only on the low'part of the magnetization curve, whereas the flux in' creases much slower than the ampere turns on that part of the magnetization curve on which the machine usually operates. In a machinehavingthisusualmagnetic structure, the field, in case of variation in the voltage applied thereto, does not vary in proportion to the voltage, and consequently, the speed of. such a machlne 1f operated as a motor would vary with the voltage applied to the termi nals thereof, and the voltage of such a machine if operated as a generator would vary with the speed ofthe machine.

In accordance with the invention, is .provided the magnetic structure of a dynamo electric machine with an air gap other than that between the armature and field poles, and also shunt a portion of the magnetic flux of the field. poles away from the armature. With a machine built in accordance with the invention, the efi'ective field or flux varies substantially indirect proporvariable speed, the voltage generated 1922, I seria no. 559,593.

remain substantially constant over a wide range-of speed of the machine.

For a better understanding of the invention, reference may: be hadto the following description taken in connection with the accompanying drawing, in which Fig. 1 is a sectional view of a part of a dynamo elecmachine embodying the invention, and Fig. is a view of the field structure of Fig. i looking upwardly.

Referring to the drawing, 1 is the armature surrounded by a field magnet structure comprising a magnet frame 2 and pole pieces 3. The pole pieces are shown as provided withfield coils i. There, is the usual air gap between the armature and pole pieces and an additional air gap 6 in the magnetic circuit, which has been shown between. the ma netframe 2 andthepole pieces 3. Magnetic shunts 7 are provided for shunting a portion of the magnetic flux of the pole pieces away from the armature. These magnetic shunts or members 7 connect the pole pieces and are ad acent the armature.

vThe magnetic circuit of the magneticinenr here 7 includes the air gap .6, but not the air gap to make the magnetic flux through the arm a- By ineansof this arrangement of air gaps and magnetic shunts, it is possible ture substantially proportional to the ampere turns producing it, within any desired range. By suitably. proportioning the air gaps and magnetic shunts, the magnetic conditions may be varied through wide limits.

My invention is particularly applicable to .a dynamo electric machine operating as a shunt or flat compounded motor or generator. If such a motor is operated on a circuit thevoltage of whichvaries over wide limits, its speed would remainsubstantially constant. If such generator is driven at by it would be substantially constant.

'It should be understood that the invenion has other applications, and that various modifications may be made therein which do not depart from the spirit and scope of the invention as set forth in the following claims;

What is claimed and sought to be secured by Letters Patent of the United States, is,--

1. In a dynamo electric machine, an armature, afield magnet structure comprising a magnet frame and pole pieces and having an air gap in the magnetic circuit other than that between said field poles and armature, and means for shunting a portion of the magnetic flux of said pole pieces away from said armature.

2. In a dynamo electric machine, an armature, a field magnet structure comprising a magnet frame and pole pieces and having an air gap in the magnetic circuit other than that between said field poles and armature, and magnetic members connecting said pole pieces, said magnetic members being adjacent said armature and shunting a portion of the magnetic flux of said pole pieces away from said armature.

3. In a dynamo electric machine, an armature, a field magnet structure comprising a magnet frame and pole pieces and an air gap between said frame and pole pieces, and

means for shunting a portion of the magnetic flux of said pole pieces away fron'i said armature.

l. In a dynamo electric machine, an armature, a field magnet structure comprising a magnet frame and pole pieces and having an air gap between said frame and pole pieces and magnetic members connecting said pole pieces, said magnetic members being adja -tent said arn'iature and shunting a portion of the magnetic flux of said pole pieces away from said armature.

In witness whereof, I have hereunto set my hand this twenty-first day of April, 1922-.

AUGUSTE IDLSBETH KOCH, zldministmtriw 0/ Pant August Koo/1., deceased. 

